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Related Questions:

Check engine light on , check DTC'S - diagnostic trouble codes ! Check Engine Light On If not familiar with this take it to a ASE certified repair shop or dealer . 3rd limp mode ? Do you have a message in the DIC - driver information center , reduced power mode ?
ENGINE POWER IS REDUCED
Engine Control Module Description for the 4.8L, 5.3L, 6.0L and 6.2L engine

Are you getting a
ENGINE POWER REDUCED message ? Is the check engine light on ?
Reduced Engine Power Mode
Throttle Actuator Control (TAC) System
electronic throttle control .
When the ECM detects a condition with the TAC system the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
?€¢
Limited torque

?€¢
Limited range of throttle movement

?€¢
Engine OFF

Your going to need to take this to a ASE certified repair shop or the dealer , you probably don't have the diagnostic tools to trouble shoot this problem. https://youtu.be/oPPLAHSSluw

The fault codes have nothing to do with it sitting for a few days. There are sensors that work with your ABS brakes and TCS to help your car maintain control when corning briskly under load. You probably have a bad sensor on one of the wheels. Recommend you get the Haynes manual to see exactly how to test and replace them. A multimeter will help too.

Eml is the throttle fault light for the electronic throttle control you will need to get the fault codes read to find out which end the problem or problems are at on the throttle control
Asc is the traction control and when wheel spin is detected it shuts the butterfly on the one throttle body until the wheel spin is reduced get the actuator in the wheel well checked for damage to the wiring to the throttle body

The traction control uses the speed sensor in the transmission and the wheel speed sensors to determine wheel spin. If a wheel spins braking is applied to it so that the power can be transferred to the other wheels. At some point the ECU detected a gross disagreement between the sensors and so as a precaution has entered into a limp home mode. On some systems if the fault is in error it can be cleared by putting the car into drive and moving forward a meter, putting in reverse and going a back a meter and doing this three times. If one or other of the sensors are faulty this process will not allow the error to be cleared. You need to check or have checked the error codes and the speed sensors.